CN110558849A

CN110558849A - anti-overflow device, anti-overflow control method and system and cooking appliance

Info

Publication number: CN110558849A
Application number: CN201810574323.XA
Authority: CN
Inventors: 徐辉任; 王志锋; 许其养; 严平; 刘传兰; 刘志才; 杜放
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2018-06-06
Filing date: 2018-06-06
Publication date: 2019-12-13
Anticipated expiration: 2038-06-06
Also published as: CN110558849B

Abstract

The invention provides an overflow preventing device, comprising: a piezoelectric sensor, the piezoelectric sensor comprising: the vibration exciting circuit is electrically connected with the piezoelectric element to excite the piezoelectric element to vibrate, the piezoelectric element is arranged on the cooking utensil, the piezoelectric element changes the prior vibration frequency according to the change of the pressure acted on the piezoelectric element by the cooking utensil, and the vibration picking circuit is electrically connected with the piezoelectric element and used for detecting the change of the vibration frequency of the piezoelectric element; a control device, comprising: the data processing module is electrically connected with the vibration pickup circuit and used for processing the vibration frequency and generating a corresponding control signal; and the communication module is electrically connected with the data processing module and used for sending a control signal to a controller of a heating device of the cooking appliance, and the communication module is a wireless communication module. When the cooking utensil boils and overflows, the strong impact on the piezoelectric element can change the vibration frequency of the piezoelectric element, and then whether the cooking utensil overflows or not can be accurately judged by detecting the vibration frequency of the piezoelectric element.

Description

Anti-overflow device, anti-overflow control method and system and cooking appliance

Technical Field

the invention belongs to the technical field of kitchen household appliances, and particularly relates to an anti-overflow device, an anti-overflow control method, an anti-overflow control system, computer equipment, a computer-readable storage medium and a cooking appliance.

Background

the electromagnetic oven has the problem of boiling and overflowing during the use process of cooking soup and porridge, so that the product quality and the user experience are greatly reduced.

the general method is a passive anti-overflow structure design, for example, a water guiding rib with a flow channel function is arranged around a heat dissipation hole of the induction cooker, and a drain hole is arranged at the end of the water guiding rib, when the overflow volume of the induction cooker is large, water passes through the water guiding rib and is quickly drained to the outside of the induction cooker through the drain hole. However, the passive overflow-preventing structural design can not realize overflow early warning and intelligent control, and the potential risk of overflow-preventing failure exists when the water quantity is too large or the heating is too fast. There is also a method of arranging a columnar anti-overflow probe in the pan, but the overflow detection can be realized only by contacting food, and the installation and cleaning of the electrodes are inconvenient.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the present invention provides an overfill prevention device.

a second aspect of the present invention provides an overfill prevention control method.

a third aspect of the present invention provides an overfill prevention control system.

A fourth aspect of the invention provides a computer device.

A fifth aspect of the invention provides a computer-readable storage medium.

A sixth aspect of the present invention provides a cooking appliance.

in view of this, according to a first aspect of the present invention, there is provided a spill prevention device for a cooking appliance, the spill prevention device comprising: a piezoelectric sensor, the piezoelectric sensor comprising: the vibration exciting circuit is electrically connected with the piezoelectric element to excite the piezoelectric element to vibrate, the piezoelectric element is arranged on the cooking utensil, the piezoelectric element changes the prior vibration frequency according to the change of the pressure acted on the piezoelectric element by the cooking utensil, and the vibration picking circuit is electrically connected with the piezoelectric element and used for detecting the change of the vibration frequency of the piezoelectric element; a control device, comprising: the data processing module is electrically connected with the vibration pickup circuit and used for processing the vibration frequency and generating a corresponding control signal; and the communication module is electrically connected with the data processing module and used for sending a control signal to a controller of a heating device of the cooking appliance, and the communication module is a wireless communication module.

The overflow preventing device comprises a piezoelectric sensor and a control device, wherein the piezoelectric sensor comprises a piezoelectric element made of piezoelectric materials, an excitation circuit and a vibration pickup circuit; the excitation circuit is electrically connected with the piezoelectric element and used for providing voltage for the piezoelectric element to enable the piezoelectric element to deform for vibration; the vibration pickup circuit is electrically connected with the piezoelectric element and is used for detecting the vibration frequency of the piezoelectric element. Because cooking utensil boiling when excessive, can cause strong impact to the piezoelectric element under the influence of self acceleration, can cause the change to the vibration frequency of piezoelectric element, and then detect the vibration frequency of piezoelectric element through picking up the vibration circuit, can accurately judge whether cooking utensil is about to overflow, and can realize the non-contact anti-overflow, avoid adopting probe isotructure contact to eat the material, influence edible security that brings, difficult washing probe scheduling problem. Through the data processing module among the controlling means, handle the vibration frequency that the circuit detected that shakes picking up, and generate corresponding control signal, rethread wireless communication module sends control signal for cooking utensil's heating device's controller, the intelligent control of anti-overflow has been realized on the one hand, on the other hand has realized the initiative early warning before the boiling overflows, be favorable to in time controlling heating device to reduce heating power or stop heating and prevent overflowing, and needn't complicated wiring alright transmit control signal to heating device's controller.

In addition, according to the anti-overflow device in the above technical solution provided by the present invention, the following additional technical features may also be provided:

in the above-described aspect, the piezoelectric element is preferably any one of a quartz crystal, lithium niobate, lithium tantalate, lithium gallate, and bismuth germanate.

in the technical scheme, the piezoelectric element can be a quartz crystal, or lithium niobate, lithium tantalate, lithium gallate or bismuth germanate, and the piezoelectric element can be made of a piezoelectric material with sensitive reaction.

in any of the above technical solutions, preferably, the overflow preventing device further includes: and the power supply module is electrically connected with the piezoelectric sensor and the control device respectively to supply power to the piezoelectric sensor and the control device.

in the technical scheme, the piezoelectric sensor and the control device can be provided with a separate power supply module, so that the anti-overflow device can be conveniently arranged at a proper position of the cooking appliance without considering the power supply problems of the piezoelectric sensor and the control device.

a second aspect of the present invention provides an anti-overflow control method, which acquires a vibration frequency of a piezoelectric element in real time; processing the obtained vibration frequency; judging whether the processing result meets a preset condition or not; and when the processing result meets the preset condition, sending a control signal to adjust the heating power of the heating device.

Because cooking utensil boiling is excessive, can cause strong impact to the piezoelectric element under the influence of self acceleration, can cause the change to the vibration frequency of piezoelectric element, therefore, this technical scheme is through the vibration frequency who obtains the piezoelectric element in real time, and handle the vibration frequency who obtains, judge whether cooking utensil is about to overflow according to the processing result, and send corresponding control signal, can accurately judge whether cooking utensil is about to overflow, and because detect to the piezoelectric element, non-contact anti-overflow has been realized, avoid adopting structures such as probe contact edible material, the edible security of influence brought, difficult washing probe scheduling problem, intelligent control and the initiative early warning before the boiling overflows of anti-overflow have been realized, be favorable to in time controlling heating device and reduce heating power or stop heating and prevent overflow.

In any of the above technical solutions, preferably, before the step of obtaining the vibration frequency of the piezoelectric element in real time, the method further includes: and after receiving the vibration instruction, controlling the piezoelectric element to vibrate.

in the technical scheme, before the step of acquiring the vibration frequency of the piezoelectric element in real time, the piezoelectric element can be powered on after receiving a vibration instruction, the piezoelectric element is controlled to vibrate according to a certain frequency, the subsequent monitoring on the vibration frequency of the piezoelectric element is facilitated, and whether the cooker is about to overflow or not is judged in the change of the vibration frequency. Specifically, the vibration instruction can be triggered and generated when the whole cooking appliance is started, and the vibration instruction can also be triggered and generated when the heating device is started.

In any of the above technical solutions, preferably, the step of processing the acquired vibration frequency specifically includes: processing a plurality of vibration frequencies acquired within a preset time period according to a preset rule to obtain a frequency representative value f 0; a difference between the currently acquired vibration frequency and the frequency representative value f0 is calculated.

In the technical scheme, in the initial stage of cooking, in the preset time period after the food materials are added, because the temperature of a pot of a cooking appliance is low, at the moment, the pot and the food inside the pot are in a relatively static state, and a vibration pickup circuit can detect that a piezoelectric element vibrates at a relatively stable vibration frequency, at the moment, the vibration condition of the piezoelectric element before boiling can be accurately known by selecting a frequency representative value f0 at the stage, so that whether the overflow is about to occur or not can be judged according to the fluctuation condition of the vibration frequency of the piezoelectric element when the overflow is about to occur.

in any of the above technical solutions, preferably, the step of processing the plurality of vibration frequencies acquired within a preset time period according to a preset rule to obtain the frequency representative value f0 specifically includes: calculating an average value of a plurality of vibration frequencies acquired within a preset time period as a frequency representative value f 0; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 0.

In the technical scheme, because the variation range of the plurality of vibration frequencies obtained in the preset time period is small and tends to be stable, the average value of the plurality of vibration frequencies obtained in the preset time period can be calculated to serve as the frequency representative value f0 and serve as a judgment reference for comparing with the currently obtained vibration frequency, and the judgment is more accurate; any vibration frequency can be selected from a plurality of vibration frequencies acquired within the preset time period as the frequency representative value f0, so that the calculation process is simplified, and quick implementation is facilitated.

in any of the above technical solutions, preferably, the step of determining whether the processing result meets the preset condition specifically includes: and judging whether the difference value is greater than or equal to a preset first threshold value.

In the technical scheme, when the difference between the currently acquired vibration frequency and the frequency representative value f0 is greater than or equal to a preset first threshold, at this time, it is described that the fluctuation range of the vibration frequency of the piezoelectric element is large, and further, it is proved that the vibration condition of the cooking appliance affecting the vibration frequency is severe, it is determined that the cooking appliance is in a boiling state and will overflow at this time, so that a control signal is timely sent out to control the heating device of the cooking appliance to reduce the heating power or stop heating.

In any of the above technical solutions, preferably, the step of processing the acquired vibration frequency specifically includes: judging whether the difference values of the successively acquired vibration frequencies within the preset time length are all smaller than a preset change value; when the difference values of the vibration frequencies acquired successively in the preset time length are smaller than the preset change value, processing the plurality of vibration frequencies acquired in the preset time length according to a preset rule to obtain a frequency representative value f 1; a difference between the currently acquired vibration frequency and the frequency representative value f1 is calculated.

in the cooking process, due to the fact that the food materials are added subsequently, the overall weight of the cooker and the food materials is increased, the vibration frequency of the piezoelectric element can be influenced instantaneously, and the piezoelectric element is made to vibrate according to the changed vibration frequency without other interference. Furthermore, whether the difference values of the vibration frequencies acquired successively in the preset time period are smaller than a preset change value or not is judged, when the difference values of the vibration frequencies acquired successively in the preset time period are smaller than the preset change value, the cooker is proved to be in a stable temperature rising state at the moment, boiling does not occur, the frequency representative value f1 is determined from the acquired multiple vibration frequencies according to a preset rule, and the frequency representative value f1 is updated under the condition that the difference values of the vibration frequencies acquired successively in another preset time period are smaller than the preset change value in the follow-up process, so that the influence on the piezoelectric element caused by the fact that food materials are added or reduced in the follow-up process in the cooker can be avoided, and the accuracy of judging whether overflow occurs or not is improved.

in any of the above technical solutions, preferably, the operation of processing the plurality of vibration frequencies acquired within the preset time period according to the preset rule to obtain the frequency representative value f1 specifically includes: calculating an average value of a plurality of vibration frequencies acquired within the preset time period as a frequency representative value f 1; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 1.

in the technical scheme, because the variation range of the plurality of vibration frequencies obtained in the preset time length is small and tends to be stable, the average value of the plurality of vibration frequencies obtained in the preset time period can be calculated to serve as the frequency representative value f1 and serve as a judgment reference for comparing with the currently obtained vibration frequency, and the judgment is more accurate; any vibration frequency can be selected from a plurality of vibration frequencies acquired within the preset time period as the frequency representative value f1, so that the calculation process is simplified, and quick implementation is facilitated.

in any of the above technical solutions, preferably, the step of determining whether the processing result meets the preset condition specifically includes: looking up a second threshold value corresponding to the frequency representative value f1 in a pre-stored database; judging whether the difference value is greater than or equal to a second threshold value; and when the difference is smaller than the second threshold, returning to execute to judge whether the difference of the successively acquired vibration frequencies within the preset time length is smaller than a preset change value.

in the technical scheme, a second threshold corresponding to the frequency representative value f1 is searched in a pre-stored database, whether the difference is greater than or equal to the second threshold is judged, since the frequency representative value f1 is the frequency representative value f1 with small fluctuation amplitude of front and back vibration frequencies within a preset time period closest to the current time point, and further, by comparing the difference between the current vibration frequency and the frequency representative value f1 with the second threshold corresponding to the frequency representative value f1, the occurrence of misjudgment caused by impact of cookware and food material weight change on the piezoelectric element can be avoided, and the judgment accuracy is improved.

in any of the above technical solutions, preferably, the acquired vibration frequency is processed; the step of judging whether the processing result meets the preset condition specifically comprises the following steps: calculating the difference value of the vibration frequencies acquired successively within the preset time length; and judging whether each difference value obtained by calculation in the preset time length is greater than a preset third threshold value.

in the technical scheme, due to the change of the overall weight of the cookware and the food materials, only the vibration frequency of the piezoelectric element can be instantaneously fluctuated, and then if the vibration frequency is not interfered by other factors, the vibration frequency can be vibrated according to a new vibration frequency, the fluctuation range is very small, and further within a preset time period through judgment, namely within a continuous period of time, if the difference value of the vibration frequency obtained successively is greater than a preset third threshold value, the boiling of the cooking appliance can be directly judged and about to overflow, the fluctuation of the vibration frequency of the piezoelectric element is brought, and the occurrence of misjudgment can be effectively avoided.

A third aspect of the present invention provides an overfill prevention control system comprising: the acquisition unit is used for acquiring the vibration frequency of the piezoelectric element in real time; the processing unit is used for processing the acquired vibration frequency; the judging unit is used for judging whether the processing result meets a preset condition or not; and the communication unit is used for sending out a control signal to adjust the heating power of the heating device when the processing result meets the preset condition.

When the cooking utensil is boiled and overflowed, strong impact can be caused to the piezoelectric element under the influence of self acceleration, the vibration frequency of the piezoelectric element can be changed, therefore, the technical proposal comprises the steps of acquiring the vibration frequency of the piezoelectric element in real time through the acquisition unit, processing the acquired vibration frequency through the processing unit, judging whether the cooking utensil is about to overflow or not according to the processing result, sending out a corresponding control signal, whether excessive can accurately judge cooking utensil be about to, and because detect to piezoelectric element, realized the non-contact anti-overflow, avoid adopting probe isotructure contact to eat the material, the influence that brings is edible security, difficult washing probe scheduling problem, has realized the intelligent control of anti-overflow and the initiative early warning before the boiling overflows, is favorable to in time controlling heating device to reduce heating power or stop heating and prevents excessive.

In the above technical solution, preferably, the spill-proof control system further includes: and the control unit is used for controlling the piezoelectric element to vibrate after receiving the vibration instruction before the step of acquiring the vibration frequency of the piezoelectric element in real time.

In the technical scheme, before the step of acquiring the vibration frequency of the piezoelectric element in real time through the control unit, the piezoelectric element can be powered on after receiving a vibration instruction, the piezoelectric element is controlled to vibrate according to a certain frequency, the vibration frequency of the piezoelectric element is conveniently monitored subsequently, and whether the cooker is about to overflow or not is judged in the change of the vibration frequency. Specifically, the vibration instruction can be triggered and generated when the whole cooking appliance is started, and the vibration instruction can also be triggered and generated when the heating device is started.

In any of the above technical solutions, preferably, the processing unit specifically includes: the first processing subunit is configured to process, according to a preset rule, a plurality of vibration frequencies acquired within a preset time period to obtain a frequency representative value f 0; a first calculation subunit operable to calculate a difference between the currently acquired vibration frequency and the frequency representative value f 0.

In the technical scheme, in the initial stage of cooking, in the preset time period after the food materials are added, because the temperature of the pot of the cooking appliance is low, at the moment, the pot and the food inside the pot are in a relatively static state, the vibration pickup circuit can detect that the piezoelectric element vibrates at a relatively stable vibration frequency, at the moment, the frequency representative value f0 is selected by the first processing subunit at the stage, so that the vibration condition of the piezoelectric element before boiling can be accurately known, and whether the overflow is about to occur or not can be judged according to the fluctuation condition of the vibration frequency of the piezoelectric element when the overflow is about to occur.

In any of the above technical solutions, preferably, the first processing subunit is specifically configured to calculate an average value of a plurality of vibration frequencies acquired within a preset time period, as the frequency representative value f 0; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 0.

In the technical scheme, because the variation range of the plurality of vibration frequencies obtained in the preset time period is small and tends to be stable, the first processing subunit can calculate the average value of the plurality of vibration frequencies obtained in the preset time period as the frequency representative value f0 and can judge more accurately as a judgment reference for comparing with the currently obtained vibration frequency; the first processing subunit may also select any one of the vibration frequencies acquired within the preset time period as the frequency representative value f0, so as to simplify the calculation process and facilitate quick implementation.

In any of the foregoing technical solutions, preferably, the determining unit is specifically configured to determine whether the difference is greater than or equal to a preset first threshold.

In any of the above technical solutions, preferably, the processing unit specifically includes: the first judgment subunit is used for judging whether the difference values of the vibration frequencies acquired successively in the preset time length are all smaller than a preset change value; the second processing subunit is configured to, when the difference values of the vibration frequencies successively acquired within the preset time period are all smaller than the preset variation value, process the plurality of vibration frequencies acquired within the preset time period according to a preset rule to obtain a frequency representative value f 1; and a second calculation subunit operable to calculate a difference between the currently acquired vibration frequency and the frequency representative value f 1.

In the cooking process, due to the fact that the food materials are added subsequently, the overall weight of the cooker and the food materials is increased, the vibration frequency of the piezoelectric element can be influenced instantaneously, and the piezoelectric element is made to vibrate according to the changed vibration frequency without other interference. Furthermore, whether the difference values of the vibration frequencies acquired successively in the preset time period are all smaller than a preset change value is judged through the first judging subunit, when the difference values of the vibration frequencies acquired successively in the preset time period are all smaller than the preset change value, the fact that the cooker is in a stable temperature rising state at the moment and boiling does not occur is proved, the frequency representative value f1 is determined from the acquired multiple vibration frequencies according to a preset rule, and in the case that the difference values of the vibration frequencies acquired successively in another preset time period are all smaller than the preset change value in the follow-up process, the frequency representative value f1 is updated, the influence on the piezoelectric element caused by the fact that food materials are added or reduced in the follow-up process in the cooker can be avoided, and the accuracy of judging whether overflow occurs is improved.

in any one of the foregoing technical solutions, preferably, the second processing subunit is specifically configured to, when differences between vibration frequencies successively acquired in a preset time period are all smaller than a preset variation value, calculate an average value of a plurality of vibration frequencies acquired in the preset time period, as a frequency representative value f 1; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 1.

In the technical scheme, because the variation range of the plurality of vibration frequencies obtained in the preset time length is small and tends to be stable, the second processing subunit can calculate the average value of the plurality of vibration frequencies obtained in the preset time period as the frequency representative value f1 and can judge more accurately as a judgment reference for comparing with the currently obtained vibration frequency; the second processing subunit may also select any one of the vibration frequencies acquired within the preset time period as the frequency representative value f1, so as to simplify the calculation process and facilitate quick implementation.

In any of the foregoing technical solutions, preferably, the determining unit is specifically configured to search a pre-stored database for a second threshold corresponding to the frequency representative value f 1; judging whether the difference value is greater than or equal to a second threshold value; and when the difference value is smaller than the second threshold value, returning to activate the first judgment subunit.

in the technical scheme, a judging unit searches a pre-stored database for a second threshold corresponding to a frequency representative value f1, judges whether the difference is greater than or equal to the second threshold, and compares the difference between the current vibration frequency and a frequency representative value f1 with the second threshold corresponding to a frequency representative value f1, so that the occurrence of misjudgment caused by impact of weight changes of cookware and food materials on a piezoelectric element can be avoided, and the judgment accuracy is improved.

In any of the above technical solutions, preferably, the processing unit is specifically configured to calculate a difference between successively acquired vibration frequencies within a preset time period; and the judging unit is specifically configured to judge whether each difference calculated within the preset time period is greater than a preset third threshold.

A fourth aspect of the present invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the spill control method according to any one of the above-mentioned technical solutions when executing the computer program.

In the computer device provided by the present invention, when the processor executes the computer program stored in the memory, the steps of the anti-overflow control method in any one of the above technical solutions can be implemented, so that all the beneficial technical effects of the above anti-overflow control method are achieved, and are not described herein again.

A fifth aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the spill control method according to any one of the above-mentioned technical solutions.

in the computer-readable storage medium provided by the present invention, when being executed by the processor, the computer program stored thereon can implement the steps of the anti-overflow control method according to any one of the above technical solutions, so that all the beneficial technical effects of the anti-overflow control method are achieved, and are not described herein again.

A sixth aspect of the present invention provides a cooking appliance comprising: a panel for holding a pot; a heating device; and an anti-overflow device as in any one of the above technical solutions.

the cooking appliance provided by the invention has the advantages of the anti-overflow device in any one of the above technical schemes, and further has the advantages of the anti-overflow device in any one of the above technical schemes, which are not repeated herein. Preferably, the cooking appliance is an electric rice cooker.

in any of the above technical solutions, preferably, the piezoelectric element is disposed on a lower surface of the panel.

In this technical scheme, through setting up the piezoelectric element at the lower surface of panel, because the gravity of pan is born to the panel mainly used, and then the impact of pan when excessive can effectively be experienced to the piezoelectric element to according to the influence of pan acceleration in vibration process, change the vibration frequency of self.

in any of the above technical solutions, preferably, the cooking appliance further includes: and the power supply device is electrically connected with the power supply module of the anti-overflow device and the heating device respectively.

in this technical solution, the cooking appliance further has a power supply device, which can simultaneously supply power to the overflow prevention device and the heating device, especially when the overflow prevention device does not have a power supply module, and when the overflow prevention device has the power supply module, the power supply module can be connected to the power supply device of the cooking appliance. The anti-overflow device and the heating device are powered by the unified power supply device, so that the problem of energy waste caused by additionally providing power supply modules such as batteries for the anti-overflow device is solved, the cost is increased, and the anti-overflow device is prevented from being in the cooking process and being out of work due to insufficient power supply.

in any of the above technical solutions, preferably, the cooking appliance further includes: the anti-overflow control system, the computer equipment and the computer readable storage medium according to any one of the above technical solutions.

additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a cooking appliance of an embodiment of the present invention;

FIG. 2 illustrates a flow chart of an overfill prevention control method of the first embodiment of the present invention;

FIG. 3 illustrates a flow chart of an overfill prevention control method of a second embodiment of the present invention;

Fig. 4 shows a flowchart of an overfill prevention control method of a third embodiment of the present invention;

Fig. 5 is a flowchart illustrating an overfill prevention control method of a fourth embodiment of the present invention;

Fig. 6 shows a flowchart of an overfill prevention control method of a fifth embodiment of the present invention;

FIG. 7 shows a schematic block diagram of an overfill prevention control system of the first embodiment of the present invention;

FIG. 8 shows a schematic block diagram of an overfill prevention control system of a second embodiment of the present invention;

FIG. 9 shows a schematic block diagram of an overfill prevention control system of a third embodiment of the present invention;

FIG. 10 shows a schematic block diagram of an overfill prevention control system of a fourth embodiment of the present invention;

FIG. 11 shows a schematic block diagram of an overfill prevention control system of a fifth embodiment of the present invention;

FIG. 12 illustrates a computer device of one embodiment of the invention.

Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:

10 pots, 12 cooking utensils, 14 piezoelectric elements, 16 vibration exciting circuits and 18 vibration pickup circuits.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

an overfill prevention device, an overfill prevention control method and system, a computer device, a computer-readable storage medium, and a cooking appliance according to some embodiments of the present invention are described below with reference to fig. 1-12.

As shown in fig. 1, a first embodiment of the present invention provides an overflow prevention device for a cooking appliance 12, the overflow prevention device comprising: a piezoelectric sensor, the piezoelectric sensor comprising: the cooking appliance comprises a piezoelectric element 14, an excitation circuit 16 and a vibration pickup circuit 18, wherein the excitation circuit 16 is electrically connected with the piezoelectric element 14 to excite the piezoelectric element 14 to vibrate, the piezoelectric element 14 is arranged on the cooking appliance 12, the piezoelectric element 14 changes the previous vibration frequency according to the change of the pressure acted on the piezoelectric element 14 by the cooking appliance 12, and the vibration pickup circuit 18 is electrically connected with the piezoelectric element 14 and used for detecting the change of the vibration frequency of the piezoelectric element 14; a control device, comprising: the data processing module is electrically connected with the vibration pickup circuit 18 and is used for processing the vibration frequency and generating a corresponding control signal; and a communication module electrically connected to the data processing module for sending a control signal to a controller of the heating device of the cooking appliance 12, wherein the communication module is a wireless communication module.

The overflow preventing device comprises a piezoelectric sensor and a control device, wherein the piezoelectric sensor comprises a piezoelectric element 14 made of piezoelectric materials, an excitation circuit 16 and a vibration pickup circuit 18; the excitation circuit 16 is electrically connected to the piezoelectric element 14, and is configured to provide a voltage to the piezoelectric element 14 to deform the piezoelectric element 14 for vibration; the vibration pickup circuit 18 is electrically connected to the piezoelectric element 14 for detecting a vibration frequency of the piezoelectric element 14. Because cooking utensil 12 boiling is excessive, can cause strong impact to piezoelectric element 14 under the influence of self acceleration, can cause the change to the vibration frequency of piezoelectric element 14, and then detect the pressure variation of piezoelectric element 14 through vibration pickup circuit 18 to detect the vibration frequency of piezoelectric element 14, can accurately judge cooking utensil 12 and be about to overflow, and can realize the non-contact anti-overflow, avoid adopting structures such as probe to contact the edible material, the influence that brings is eaten security, difficult washing probe scheduling problem. Through the data processing module among the controlling means, handle the vibration frequency that vibration pickup circuit 18 detected, and generate corresponding control signal, rethread wireless communication module sends control signal for cooking utensil 12's heating device's controller, has realized the intelligent control of anti-overflow on the one hand, and on the other hand has realized the initiative early warning before the boiling overflows, is favorable to in time controlling heating device to reduce heating power or stop heating and prevent overflowing, and needn't complicated wiring alright transmit control signal to heating device's controller. Specifically, the excitation circuit 16 at least includes a power supply for vibrating the piezoelectric element 14, and the vibration pickup circuit 18 may include a device for counting the frequency of the voltage or current change of the piezoelectric element 14, such as a single chip or a processor such as a PLC, for indirectly counting the frequency of the vibration of the piezoelectric element 14.

In one embodiment of the present invention, the piezoelectric element 14 is preferably any one of quartz crystal, lithium niobate, lithium tantalate, lithium gallate, and bismuth germanate.

in this embodiment, the piezoelectric element 14 may be a quartz crystal, or may be lithium niobate, lithium tantalate, lithium gallate or bismuth germanate, and any piezoelectric material with sensitive reaction may be used to form the piezoelectric element 14.

In one embodiment of the present invention, preferably, the overflow preventing means further comprises: and the power supply module is electrically connected with the piezoelectric sensor and the control device respectively to supply power to the piezoelectric sensor and the control device.

In this embodiment, the piezoelectric sensor and the control device may be provided with separate power supply modules to facilitate locating the overfill prevention device in the proper location on the cooking appliance 12 without having to consider the power supply issues of the piezoelectric sensor and the control device.

fig. 2 to 6 show a flowchart of an anti-spill control method according to an embodiment of the second aspect of the present invention.

As shown in fig. 2, the spill prevention control method according to the first embodiment of the present invention includes:

S102, acquiring the vibration frequency of the piezoelectric element in real time;

S104, processing the acquired vibration frequency;

S106, judging whether the processing result meets a preset condition or not;

and S108, when the processing result meets a preset condition, sending a control signal to adjust the heating power of the heating device.

As shown in fig. 3, an anti-spill control method according to a second embodiment of the present invention includes:

S202, after receiving a vibration instruction, controlling the piezoelectric element to vibrate;

s204, acquiring the vibration frequency of the piezoelectric element in real time;

S206, processing the acquired vibration frequency;

s208, judging whether the processing result meets a preset condition or not;

and S210, when the processing result meets a preset condition, sending a control signal to adjust the heating power of the heating device.

In this embodiment, before the step of obtaining the vibration frequency of the piezoelectric element in real time, after receiving the vibration instruction, the piezoelectric element may be powered on, and the piezoelectric element is controlled to vibrate according to a certain frequency, so as to facilitate subsequent monitoring of the vibration frequency of the piezoelectric element, and determine whether the pot is about to overflow from the change of the vibration frequency. Specifically, the vibration instruction can be triggered and generated when the whole cooking appliance is started, and the vibration instruction can also be triggered and generated when the heating device is started.

As shown in fig. 4, an anti-spill control method according to a third embodiment of the present invention includes:

s302, after receiving a vibration instruction, controlling the piezoelectric element to vibrate;

S304, acquiring the vibration frequency of the piezoelectric element in real time;

s306, processing a plurality of vibration frequencies acquired within a preset time period according to a preset rule to obtain a frequency representative value f 0;

s308, calculating the difference between the currently acquired vibration frequency and the frequency representative value f 0;

S310, judging whether the difference value is larger than or equal to a preset first threshold value or not; when the difference is smaller than the preset first threshold, returning to the step S304;

And S312, when the difference value is greater than or equal to the preset first threshold value, sending a control signal to adjust the heating power of the heating device.

In the technical scheme, in the initial stage of cooking, in the preset time period after the food materials are added, because the temperature of a pot of a cooking appliance is low, at the moment, the pot and the food inside the pot are in a relatively static state, and a vibration pickup circuit can detect that a piezoelectric element vibrates at a relatively stable vibration frequency, at the moment, the vibration condition of the piezoelectric element before boiling can be accurately known by selecting a frequency representative value f0 at the stage, so that whether the overflow is about to occur or not can be judged according to the fluctuation condition of the vibration frequency of the piezoelectric element when the overflow is about to occur. In addition, when the difference between the currently acquired vibration frequency and the frequency representative value f0 is greater than or equal to the preset first threshold, at this time, it is indicated that the fluctuation range of the vibration frequency of the piezoelectric element is large, and thus it is proved that the vibration condition of the cooking appliance affecting the vibration frequency is severe, and it is determined that the cooking appliance is in a boiling state and will overflow at this time, so as to send out a control signal in time to control the heating device of the cooking appliance to reduce the heating power or stop heating.

in any of the above embodiments, preferably, the step of processing the plurality of vibration frequencies acquired within the preset time period according to a preset rule to obtain the frequency representative value f0 specifically includes: calculating an average value of a plurality of vibration frequencies acquired within a preset time period as a frequency representative value f 0; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 0.

In this embodiment, since the variation range of the plurality of vibration frequencies obtained within the preset time period is small and tends to be stable, the average value of the plurality of vibration frequencies obtained within the preset time period may be calculated as the frequency representative value f0, which is used as a determination reference for comparing with the currently obtained vibration frequency, and the determination is more accurate; any vibration frequency can be selected from a plurality of vibration frequencies acquired within the preset time period as the frequency representative value f0, so that the calculation process is simplified, and quick implementation is facilitated.

as shown in fig. 5, an anti-spill control method according to a fourth embodiment of the present invention includes:

S402, after receiving a vibration instruction, controlling the piezoelectric element to vibrate;

S404, acquiring the vibration frequency of the piezoelectric element in real time;

s406, judging whether the difference values of the vibration frequencies acquired successively in the preset time length are all smaller than a preset change value;

S408, when the difference values of the vibration frequencies acquired successively in the preset time length are smaller than the preset change value, processing the plurality of vibration frequencies acquired in the preset time length according to a preset rule to obtain a frequency representative value f 1;

s410, calculating a difference value between the currently acquired vibration frequency and the frequency representative value f 1;

s412, searching a pre-stored database for a second threshold corresponding to the frequency representative value f 1;

s414, judging whether the difference value is larger than or equal to a second threshold value, and returning to S404 when the difference value is smaller than the second threshold value;

And S416, when the difference value is larger than or equal to the second threshold value, sending a control signal to adjust the heating power of the heating device.

In addition, whether the difference value is larger than or equal to the second threshold value is judged by searching the second threshold value corresponding to the frequency representative value f1 in a pre-stored database, and since the frequency representative value f1 is the frequency representative value f1 with small fluctuation amplitude of front and back vibration frequencies within the preset time period closest to the current time point, and further, by comparing the difference value between the current vibration frequency and the frequency representative value f1 with the second threshold value corresponding to the frequency representative value f1, the occurrence of misjudgment caused by impact of weight changes of cookware and food materials on the piezoelectric element can be avoided, and the judgment accuracy is improved.

In any of the above embodiments, preferably, the operation of processing the plurality of vibration frequencies acquired within the preset time period according to the preset rule to obtain the frequency representative value f1 specifically includes: calculating an average value of a plurality of vibration frequencies acquired within the preset time period as a frequency representative value f 1; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 1.

In this embodiment, since the variation range of the plurality of vibration frequencies obtained within the preset time period is small and tends to be stable, the average value of the plurality of vibration frequencies obtained within the preset time period may be calculated as the frequency representative value f1, and the average value may be used as a determination reference for comparing with the currently obtained vibration frequency, so that the determination is more accurate; any vibration frequency can be selected from a plurality of vibration frequencies acquired within the preset time period as the frequency representative value f1, so that the calculation process is simplified, and quick implementation is facilitated.

As shown in fig. 6, an anti-spill control method according to a fifth embodiment of the present invention includes:

s502, after receiving a vibration instruction, controlling the piezoelectric element to vibrate;

S504, acquiring the vibration frequency of the piezoelectric element in real time;

S506, calculating the difference value of the successively acquired vibration frequencies within the preset time length;

s508, judging whether each difference value obtained by calculation in the preset time length is larger than a preset third threshold value; when not all the difference values are larger than the preset third threshold value, returning to the step S504;

and S510, when each difference value is larger than a preset third threshold value, sending a control signal to adjust the heating power of the heating device.

In this embodiment, because the overall weight of the cookware and the food material changes, only the vibration frequency of the piezoelectric element is subjected to instantaneous fluctuation, and then if the vibration frequency is not subjected to other interference, the vibration frequency is vibrated according to a new vibration frequency, the fluctuation range is small, and further, if the difference values of the successively acquired vibration frequencies are greater than a preset third threshold value within a preset time period, namely within a continuous period of time, the boiling of the cooking appliance is directly judged and the overflow is about to occur, so that the fluctuation of the vibration frequency of the piezoelectric element is brought, and the occurrence of misjudgment can be effectively avoided.

Fig. 7 to 11 show schematic block diagrams of an anti-spill control system according to an embodiment of the third aspect of the present invention.

As shown in fig. 7, an anti-spill control system 100 according to a first embodiment of the present invention includes:

an obtaining unit 102, configured to obtain a vibration frequency of the piezoelectric element in real time;

A processing unit 104, configured to process the acquired vibration frequency;

A judging unit 106, configured to judge whether a processing result satisfies a preset condition;

And the communication unit 108 is used for sending out a control signal to adjust the heating power of the heating device when the processing result meets the preset condition.

When the cooking utensil is boiled and overflowed, strong impact can be caused to the piezoelectric element under the influence of self acceleration, the vibration frequency of the piezoelectric element can be changed, therefore, according to the technical scheme, the vibration frequency of the piezoelectric element is acquired in real time through the acquisition unit 102, the acquired vibration frequency is processed through the processing unit 104, whether the cooking utensil is about to overflow or not is judged according to the processing result, a corresponding control signal is sent out, whether excessive can accurately judge cooking utensil be about to, and because detect to piezoelectric element, realized the non-contact anti-overflow, avoid adopting probe isotructure contact to eat the material, the influence that brings is edible security, difficult washing probe scheduling problem, has realized the intelligent control of anti-overflow and the initiative early warning before the boiling overflows, is favorable to in time controlling heating device to reduce heating power or stop heating and prevents excessive.

As shown in fig. 8, an anti-spill control system 200 according to a second embodiment of the present invention includes:

The control unit 202 is used for controlling the piezoelectric element to vibrate after receiving the vibration instruction;

An obtaining unit 204, configured to obtain the vibration frequency of the piezoelectric element in real time;

A processing unit 206 for processing the acquired vibration frequency;

A judging unit 208, configured to judge whether a processing result satisfies a preset condition;

and a communication unit 210 for sending a control signal to adjust the heating power of the heating device when the processing result satisfies a preset condition.

In this embodiment, before the step of obtaining the vibration frequency of the piezoelectric element in real time, the control unit 202 may power on the piezoelectric element after receiving the vibration instruction, control the piezoelectric element to vibrate at a certain frequency, so as to facilitate subsequent monitoring of the vibration frequency of the piezoelectric element, and determine whether the pot is about to overflow from the change of the vibration frequency. Specifically, the vibration instruction can be triggered and generated when the whole cooking appliance is started, and the vibration instruction can also be triggered and generated when the heating device is started.

As shown in fig. 9, an overfill prevention control system 300 according to a third embodiment of the present invention comprises:

a control unit 302, configured to control the piezoelectric element to vibrate after receiving the vibration instruction;

An obtaining unit 304, configured to obtain a vibration frequency of the piezoelectric element in real time;

A processing unit 306, comprising:

A first processing subunit 308, configured to process, according to a preset rule, a plurality of vibration frequencies acquired within a preset time period, to obtain a frequency representative value f0,

A first calculation subunit 310 configured to calculate a difference between the currently acquired vibration frequency and the frequency representative value f 0;

A determining unit 312, configured to determine whether the difference is greater than or equal to a preset first threshold;

A communication unit 314, configured to send a control signal to adjust the heating power of the heating device when the difference is greater than or equal to a preset first threshold.

in this embodiment, in the initial stage of cooking, in the preset time period after the food material is added, since the temperature of the pot of the cooking appliance is low, at this time, the pot and the food inside are in a relatively static state, the vibration pickup circuit can detect that the piezoelectric element vibrates at a relatively stable vibration frequency, at this time, the first processing subunit 308 selects the frequency representative value f0 at this stage, so that the vibration condition of the piezoelectric element before boiling can be accurately known, and it is convenient to determine whether overflow is about to occur according to the fluctuation condition of the vibration frequency of the piezoelectric element when overflow is about to occur. In addition, when the difference between the currently acquired vibration frequency and the frequency representative value f0 is greater than or equal to the preset first threshold, at this time, it is indicated that the fluctuation range of the vibration frequency of the piezoelectric element is large, and thus it is proved that the vibration condition of the cooking appliance affecting the vibration frequency is severe, and it is determined that the cooking appliance is in a boiling state and will overflow at this time, so as to send out a control signal in time to control the heating device of the cooking appliance to reduce the heating power or stop heating.

in the above embodiment, preferably, the first processing sub-unit 308 is specifically configured to calculate an average value of a plurality of vibration frequencies acquired within a preset time period as the frequency representative value f 0; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 0.

in this embodiment, since the variation range of the plurality of vibration frequencies obtained within the preset time period is small and tends to be stable, the first processing subunit 308 may calculate the average value of the plurality of vibration frequencies obtained within the preset time period as the frequency representative value f0, and may determine that the determination is more accurate as a determination reference for comparing with the currently obtained vibration frequency; the first processing sub-unit 308 may also select any one of the vibration frequencies obtained within the preset time period as the frequency representative value f0, so as to simplify the calculation process and facilitate quick implementation.

As shown in fig. 10, an anti-spill control system 400 according to a fourth embodiment of the present invention includes:

A control unit 402, configured to control the piezoelectric element to vibrate after receiving the vibration instruction;

An obtaining unit 404, configured to obtain a vibration frequency of the piezoelectric element in real time;

a processing unit 406, comprising:

a first judging subunit 408, configured to judge whether the difference values of the vibration frequencies successively acquired within the preset time period are all smaller than a preset variation value,

a second processing subunit 410, configured to, when the difference between the vibration frequencies successively acquired within the preset time period is smaller than the preset variation value, process the plurality of vibration frequencies acquired within the preset time period according to a preset rule to obtain a frequency representative value f1,

A second calculation subunit 412 configured to calculate a difference between the currently acquired vibration frequency and the frequency representative value f 1;

the judging unit 414 is configured to search a pre-stored database for a second threshold corresponding to the frequency representative value f1, and judge whether the difference is greater than or equal to the second threshold.

a communication unit 416 for sending a control signal to adjust the heating power of the heating device when the difference is greater than or equal to the second threshold.

In the cooking process, due to the fact that the food materials are added subsequently, the overall weight of the cooker and the food materials is increased, the vibration frequency of the piezoelectric element can be influenced instantaneously, and the piezoelectric element is made to vibrate according to the changed vibration frequency without other interference. Furthermore, whether the difference values of the vibration frequencies successively acquired within the preset time period are all smaller than a preset change value is judged through the first judging subunit 408, when the difference values of the vibration frequencies successively acquired within the preset time period are all smaller than the preset change value, it is proved that the pot is in a stable temperature rise state at the moment and boiling does not occur, at the moment, the frequency representative value f1 is determined from the acquired multiple vibration frequencies according to a preset rule, and in the case that the difference values of the vibration frequencies successively acquired within another preset time period are all smaller than the preset change value, the frequency representative value f1 is updated, the influence on the piezoelectric element caused by the fact that food materials are subsequently added or reduced in the pot can be avoided, and the accuracy of judging whether overflow occurs is improved.

in addition, the judging unit 414 searches the pre-stored database for the second threshold corresponding to the frequency representative value f1, and judges whether the difference is greater than or equal to the second threshold, since the frequency representative value f1 is the frequency representative value f1 with small fluctuation range of the front and back vibration frequencies within the preset time period closest to the current time point, and further, by comparing the difference between the current vibration frequency and the frequency representative value f1 with the second threshold corresponding to the frequency representative value f1, the occurrence of misjudgment caused by impact of cookware and food material weight change on the piezoelectric element can be avoided, and the judgment accuracy is improved.

In the above embodiment, preferably, the second processing subunit 410 is specifically configured to, when the difference values of the vibration frequencies acquired successively in the preset time period are all smaller than the preset variation value, calculate an average value of the plurality of vibration frequencies acquired in the preset time period as the frequency representative value f 1; or any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 1.

In this embodiment, since the variation range of the plurality of vibration frequencies obtained within the preset time period is small and tends to be stable, the second processing subunit 410 may calculate the average value of the plurality of vibration frequencies obtained within the preset time period as the frequency representative value f1, and may determine more accurately as a determination reference for comparing with the currently obtained vibration frequency; the second processing subunit 410 may also select any one of the vibration frequencies obtained within the preset time period as the frequency representative value f1, so as to simplify the calculation process and facilitate quick implementation.

as shown in fig. 11, an anti-spill control system 500 according to a fifth embodiment of the present invention includes:

a control unit 502, configured to control the piezoelectric element to vibrate after receiving the vibration instruction;

An obtaining unit 504, configured to obtain a vibration frequency of the piezoelectric element in real time;

The processing unit 506 is configured to calculate a difference value between successively acquired vibration frequencies within a preset time period;

a determining unit 508, configured to determine whether each difference calculated within a preset time period is greater than a preset third threshold;

A communication unit 510 for sending a control signal to adjust the heating power of the heating device when each difference is greater than a preset third threshold.

As shown in fig. 12, a fourth aspect of the present invention provides a computer device 600 comprising a memory 602, a processor 604 and a computer program stored on the memory 602 and executable on the processor 604, the steps of the anti-overflow control method according to any of the above embodiments being implemented when the computer program is executed by the processor 604.

in the computer device 600 according to the present invention, when the processor 604 executes the computer program stored in the memory 602, the steps of the anti-overflow control method in any one of the above embodiments may be implemented, so that all the beneficial technical effects of the anti-overflow control method are achieved, and are not described herein again.

As shown in fig. 1, a sixth aspect embodiment of the present invention provides a cooking appliance 12, including: a panel for holding the pot 10; a heating device; and an overfill prevention device as in any of the above embodiments.

The cooking utensil 12 provided by the present invention has the anti-overflow device according to any of the above embodiments, and further has the beneficial effects of the anti-overflow device according to any of the above embodiments, which are not repeated herein. Preferably, the cooking appliance 12 is an electric rice cooker.

In one embodiment of the present invention, the piezoelectric element 14 is preferably disposed on the lower surface of the panel.

in this embodiment, by disposing the piezoelectric element 14 on the lower surface of the panel, since the panel is mainly used for bearing the gravity of the pot 10, the piezoelectric element 14 can effectively sense the impact of the pot 10 when overflowing, and change the vibration frequency thereof according to the influence of the acceleration of the pot 10 during the vibration process.

In one embodiment of the present invention, preferably, the cooking appliance 12 further comprises: and the power supply device is electrically connected with the power supply module of the anti-overflow device and the heating device respectively.

In this embodiment, the cooking appliance 12 further has a power supply device that can simultaneously supply power to the spill prevention device and the heating device, particularly when the spill prevention device does not have a power supply module that can be turned on when the spill prevention device has the power supply module, the power supply device of the cooking appliance 12. The anti-overflow device and the heating device are powered by the unified power supply device, so that the problem of energy waste caused by additionally providing power supply modules such as batteries for the anti-overflow device is solved, the cost is increased, and the anti-overflow device is prevented from being in the cooking process and being out of work due to insufficient power supply.

in one embodiment of the present invention, preferably, the cooking appliance 12 further comprises: the anti-overflow control system, the computer equipment and the computer readable storage medium according to any one of the above technical solutions.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a spill prevention device for a cooking appliance, the spill prevention device comprising:

a piezoelectric sensor, the piezoelectric sensor comprising: the vibration exciting circuit is electrically connected with the piezoelectric element to excite the piezoelectric element to vibrate,

the piezoelectric element is arranged on the cooking utensil, the piezoelectric element changes the prior vibration frequency according to the change of the pressure acted on the piezoelectric element by the cooking utensil, and the vibration pickup circuit is electrically connected with the piezoelectric element and used for detecting the change of the vibration frequency of the piezoelectric element;

A control device, comprising:

the data processing module is electrically connected with the vibration pickup circuit and used for processing the vibration frequency and generating a corresponding control signal;

And the communication module is electrically connected with the data processing module and used for sending the control signal to a controller of a heating device of the cooking appliance, and the communication module is a wireless communication module.

2. the overfill prevention device of claim 1,

The piezoelectric element is any one of quartz crystal, lithium niobate, lithium tantalate, lithium gallate and bismuth germanate.

3. the overfill prevention device of claim 1 or 2, further comprising:

and the power supply module is electrically connected with the piezoelectric sensor and the control device respectively to supply power to the piezoelectric sensor and the control device.

4. An anti-spill control method, comprising:

Acquiring the vibration frequency of the piezoelectric element in real time;

Processing the obtained vibration frequency;

judging whether the processing result meets a preset condition or not;

and when the processing result meets the preset condition, sending a control signal to adjust the heating power of the heating device.

5. The overfill prevention control method of claim 4, further comprising, prior to said step of obtaining the frequency of vibration of the piezoelectric element in real time:

And after receiving a vibration instruction, controlling the piezoelectric element to vibrate.

6. the overfill prevention control method of claim 4 or 5, wherein said step of processing said obtained vibration frequency specifically comprises:

Processing a plurality of vibration frequencies acquired within a preset time period according to a preset rule to obtain a frequency representative value f 0;

a difference between the currently acquired vibration frequency and the frequency representative value f0 is calculated.

7. the anti-overflow control method according to claim 6, wherein the step of processing the plurality of vibration frequencies obtained within the preset time period according to the preset rule to obtain the frequency representative value f0 specifically comprises:

Calculating an average value of a plurality of vibration frequencies acquired within a preset time period as a frequency representative value f 0; or

Any one of a plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 0.

8. the anti-overflow control method according to claim 6, wherein the step of determining whether the processing result satisfies a preset condition specifically comprises:

And judging whether the difference value is greater than or equal to a preset first threshold value.

9. the overfill prevention control method of claim 4 or 5, wherein said step of processing said obtained vibration frequency specifically comprises:

judging whether the difference values of the successively acquired vibration frequencies within the preset time length are all smaller than a preset change value;

when the difference values of the vibration frequencies acquired successively in the preset time length are smaller than the preset change value, processing the plurality of vibration frequencies acquired in the preset time length according to a preset rule to obtain a frequency representative value f 1;

A difference between the currently acquired vibration frequency and the frequency representative value f1 is calculated.

10. The spill-proof control method according to claim 9, wherein the operation of processing the plurality of vibration frequencies obtained within the preset time period according to the preset rule to obtain the frequency representative value f1 specifically includes:

Calculating an average value of a plurality of vibration frequencies acquired within the preset time period as a frequency representative value f 1; or

Any one of the plurality of vibration frequencies acquired within the preset time period is selected as the frequency representative value f 1.

11. The spill-proof control method according to claim 9, wherein the step of determining whether the processing result satisfies the preset condition specifically includes:

looking up a second threshold corresponding to the frequency representative value f1 in a pre-stored database;

judging whether the difference value is larger than or equal to the second threshold value;

And when the difference is smaller than the second threshold, returning to execute the judgment of whether the difference of the successively acquired vibration frequencies within the preset time length is smaller than a preset change value.

12. The spill-proof control method according to claim 4 or 5, wherein the processing of the acquired vibration frequency; the step of judging whether the processing result meets the preset condition specifically comprises the following steps:

calculating the difference value of the vibration frequencies acquired successively within the preset time length;

And judging whether each difference value obtained by calculation in the preset time length is greater than a preset third threshold value.

13. An overfill prevention control system, comprising:

The acquisition unit is used for acquiring the vibration frequency of the piezoelectric element in real time;

The processing unit is used for processing the acquired vibration frequency;

The judging unit is used for judging whether the processing result meets a preset condition or not;

and the communication unit is used for sending a control signal to adjust the heating power of the heating device when the processing result meets the preset condition.

14. a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the spill control method according to any one of claims 4 to 12 are implemented when the computer program is executed by the processor.

15. a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the spill control method according to any one of claims 4 to 12.

16. a cooking appliance, comprising:

a panel for holding a pot;

a heating device; and

The overfill prevention device of any of claims 1-3.

17. The cooking appliance of claim 16,

the piezoelectric element is disposed on a lower surface of the panel.

18. The cooking appliance of claim 16 or 17, further comprising:

And the power supply device is electrically connected with the power supply module of the anti-overflow device and the heating device respectively.